使用字符编码Filter
package com.helloweenvsfei.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; public class CharacterEncodingFilter implements Filter { private String characterEncoding; private boolean enabled; @Override public void init(FilterConfig config) throws ServletException { characterEncoding = config.getInitParameter("characterEncoding"); enabled = "true".equalsIgnoreCase(characterEncoding.trim()) || "1".equalsIgnoreCase(characterEncoding.trim()); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if (enabled || characterEncoding != null) { request.setCharacterEncoding(characterEncoding); response.setCharacterEncoding(characterEncoding); } chain.doFilter(request, response); } @Override public void destroy() { characterEncoding = null; } }
web.xml 配置如下
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>
com.helloweenvsfei.filter.CharacterEncodingFilter
</filter-class>
<init-param><!-- 编码方式 -->
<param-name>characterEncoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param><!-- 是否使用编码 -->
<param-name>enable</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
注意：页面编码方式必须一致。另外如果使用GET表单提交。需要修改Tomcat /conf/server.xml 里的URIEncoding 修改代码如下
<Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" URIEncoding = "UTF-8"/>
基本所有的javaWeb程序都用该Filter。
附：characteEncoding.jsp验证编码器
1 <%@ page language="java" contentType="text/html; charset=UTF-8"%> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 3 <html> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 6 <title>Insert title here</title> 7 <style> 8 body, input, textarea { 9 font-size: 12px; 10 } 11 textarea { 12 400px; 13 height: 50px; 14 } 15 </style> 16 </head> 17 <body> 18 <pre> 19 <b>您输入了</b>： 20 ${ param.text } 21 </pre> 22 <form action="${ param.request.requestURL }" method="post"><textarea 23 name="text">${ param.text }</textarea> <br /> 24 <input type="submit"></form> 25 26 </body> 27 </html>